From her images of the "great, dark trees of the Big Woods" to the endless grass of the prairies in the west, Laura Ingalls Wilder's depictions of frontier life for America's pioneers in her beloved "Little House" series of children's books have won her countless fans. Now the writer's autobiography, from which she drew the material that has delighted readers for decades, will be published this autumn for the first time, more than 80 years after she first wrote it.